CPC G01L 19/147 (2013.01) [G01L 9/0041 (2013.01); G01L 19/141 (2013.01); G01L 23/24 (2013.01)] | 16 Claims |
1. A pressure sensor assembly for measuring pressure of air in a compression ignition internal combustion engine, the pressure sensor assembly comprising:
an external housing unit;
a sensor unit received within the external housing unit, the sensor unit comprising an external surface including a mounting surface;
a sensing element mounted within the sensor unit and comprising a pressure-sensing surface;
a substrate upon which the mounting surface is mounted;
an air passage which enables impingement of air on the sensing element, in use; and
a filling passage, separate from the air passage, which introduces an encapsulation material onto the sensor unit, during assembly;
wherein the encapsulation material covers at least a part of the external surface of the sensor unit but does not cover the pressure-sensing surface of the sensing element which remains directly exposed to air within the air passage.
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